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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934e2c06e0d22de6e96b644cd563a39280323393f243cf0b547a7c40169cdaf3' 
  AND token = 'sCqkF1db9OASGf6nsjdzOLwoAsL1vmkwWIKLAgp9g28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}